Merge develop into main (#313)

- Add app path get() functions to `TactilityC`
- Improved `Dispatcher` and `DispatcherThread`
- Improved `PubSub` (type safety)
- Created test for `DispatcherThread` and `PubSub`
- Save properties files on app exit (various apps) by posting it to the main dispatcher (fixes UI hanging briefly on app exit)
- Fixed bug with `SystemSettings` being read from the wrong file path.
- `loadPropertiesFile()` now uses `file::readLines()` instead of doing that manually
- Increased timer task stack size (required due to issues when reading a properties file for the very first time)
- General cleanup
- Created `EstimatedPower` driver that uses an ADC pin to measure voltage and estimate the battery charge that is left.
- Cleanup of T-Deck board (updated to new style)

Tactility/Source/app/display/Display.cpp

@@ -1,8 +1,9 @@
+#include <Tactility/Tactility.h>
+
 #include <Tactility/settings/DisplaySettings.h>
 #include <Tactility/Assets.h>
 #include <Tactility/hal/display/DisplayDevice.h>
 #include <Tactility/lvgl/Toolbar.h>
-#include <Tactility/Tactility.h>
 
 #include <lvgl.h>
 
@@ -139,7 +140,11 @@ public:
 
     void onHide(TT_UNUSED AppContext& app) override {
         if (displaySettingsUpdated) {
-            settings::display::save(displaySettings);
+            // Dispatch it, so file IO doesn't block the UI
+            const settings::display::DisplaySettings settings_to_save = displaySettings;
+            getMainDispatcher().dispatch([settings_to_save] {
+                settings::display::save(settings_to_save);
+            });
         }
     }
 };